Here are my opinions on the winners of the Contest:
Molten Cavern Zone: I thought this was staunchly the second best level in the contest; Detonation Drift Zone is the coolest SP entry I've seen in a while, and I really think it should've won. Sure, it's got a few bugs and an ugly texture here and there, but it plays well and has awesome gimmicks.
Aquatic Relic Zone: This was definitely a good level. I guess that by most contest-rating standards it was the best Match level this contest. I personally liked Complete Chaos Zone better, because it had a frantic "Meadow Match" feel to it, but I can see why it didn't win.
Clockwork Towers Zone: Graphically, this was the winner, hands down. But I have the distinct impression that most people scored it high only for its aesthetics, because gameplay was terrible. If you're talking about how it plays and only how it plays, I would have said Desert Dash Zone should have won.
Wacky Tesseract Zone: YAYZ. It's very hard for me to discuss this one objectively, of course, but I personally did like mine best. The other two levels that were really good were Jungle Ruins Zone and Egg Hall Zone. Jungle Ruins Zone was kind of short, but it had nice visuals and some cool shortcuts which perfectly balanced risk and reward. Egg Hall Zone was, to me, really more eye candy than an actual good race; I was so frustrated on this level. But that might be more a reflection of my sucking at Race than the level actually being bad.